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High efficiency multistep sinewave synthesizer

  • US 5,757,633 A
  • Filed: 11/26/1996
  • Issued: 05/26/1998
  • Est. Priority Date: 12/04/1995
  • Status: Expired due to Term
First Claim
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1. A multistep inverter for converting dc power to ac power comprising:

  • primary inverter means for converting a source of dc power to an intermediate ac power signal;

    a plurality of secondary inverter means, each having first and second output lines, for converting the intermediate ac power signal, in response to a control signal, to one of three output voltages appearing across the first and second output lines;

    a positive voltage +V, a zero voltage 0V, or a negative voltage -V;

    the plurality of secondary inverter means being stacked together in series circuit relationship so that the first output line of a 1st secondary inverter means is connected to one side of a load, the second output line of the 1st secondary inverter means is connected to the first output line of a 2d secondary inverter means, the second output line of the 2d secondary inverter means is connected to the first output line of a 3d secondary inverter means, and so on for n different secondary inverter means, where n is an integer of at least two, with the second output line of the nth secondary inverter means being connected to the other side of the load; and

    control means for generating the control signal applied to each of the plurality of secondary inverter means in a way that combines select combinations of the +V, 0V, and -V outputs from the plurality of secondary inverter means in series across the load so that the signal applied across the load approximates a sine wave.

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